STP1425: Effect of Lubricating Anodic Film on Fretting Fatigue Strength of Aluminum Alloy

    Nishida, T
    Associate Professor, Numazu College of Technology, Numazu,

    Mizutani, J
    Associate Professor, Toyama College of Maritime Technology, Shinminato,

    Mutoh, Y
    Professor, Nagaoka University of Technology, Nagaoka,

    Maejima, M
    Manager, Materials Research Laboratory, Fujikura, Limited, Tokyo,

    Pages: 16    Published: Jan 2003


    Abstract

    Wear, scratch, plain fatigue and fretting fatigue tests were carried out using aluminum alloy JIS 6063-T5 specimens with anodic film and lubricating anodic film. Though the surface hardness of lubricating anodic film was lower than that of anodic film, lubricating anodic film had excellent wear resistance and crack resistance compared to anodic film. Plain fatigue strength of the specimen with anodic film was lower than that of the specimen with lubricating anodic film, which almost coincided with that of the specimen without film. The low fatigue strength of the specimen with anodic film may result from the brittleness and tensile residual stress of the anodic film, which attribute to the cracking at lower applied stress, Cracking of the lubricating anodic film during fatigue tests hardly occurred due to its ductile nature and low residual stress and consequently the fatigue strength was not degraded. Fretting fatigue strength of the specimen with lubricating anodic film was higher than that of the specimen with anodic film, which was higher than that of the specimen without film. The lubricating anodic film had the lowest coefficient of friction and a higher cracking resistance, which contributed to the retardation crack initiation and the low crack growth rates. The anodic film also had low coefficient of friction compared to the specimen without film and prevented meta-to-metal contact, which may result in higher fatigue strength compared to the specimen without film. The lubricating anodic film is of significant benefit to fretting fatigue strength without degradation of plain fatigue strength.

    Keywords:

    plain fatigue, fretting fatigue, lubricating anodic film, anodic film, in-situ observation, tangential force coefficient


    Paper ID: STP10771S

    Committee/Subcommittee: E08.01

    DOI: 10.1520/STP10771S


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